An Introduction to Statistical Methods and Data Analysis
7th Edition
ISBN: 9781305269477
Author: R. Lyman Ott, Micheal T. Longnecker
Publisher: Cengage Learning
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For the z test, the critical region for rejection of H0:
A. Is determined only by
α
B. Is determined by
α and N
C. Allows us to accept the null hypothesis
D. Depends on N
Following is the data related to the daily production of the two factories of same product located in two different states.
Factory
Daily Production
Factory 1
66
66
73
83
74
73
73
69
82
71
73
66
67
80
79
78
Factory 2
66
63
71
65
65
67
57
48
71
73
68
58
62
81
60
62
72
72
57
77
68
Write the null and alternative hypothesis for comparing the production of two factories.
Calculate the critical values “ttab”, and tcal
Write the conclusion for the null hypothesis of part “d”
For a hypothesis test of H0:μ=μ0H0:μ=μ0 against the alternative Ha:μ<μ0Ha:μ<μ0, the z-test statistics is found to be 2.00. This finding is
a.significant at neither the 0.01 nor the 0.05 levels.
b.significant at the 0.01 level but not at the 0.05 level.
c.significant at both the 0.01 and the 0.05 levels.
d.not large enough to be considered significant.
e.significant at the 0.05 level but not at the 0.01 level.
Chapter 6 Solutions
An Introduction to Statistical Methods and Data Analysis
Ch. 6.9 - Refer to the oil-spill case study.
What are the...Ch. 6.9 - For each of the situations, set up the rejection...Ch. 6.9 - Conduct a test of H0 : μ1 μ2 – 2.3 versus Ha : μ1...Ch. 6.9 - In an effort to link cold environments with...Ch. 6.9 - The Department of Natural Resources (DNR) received...Ch. 6.9 - An industrial engineer conjectures that a major...Ch. 6.9 - The number of households currently receiving a...Ch. 6.9 - Prob. 9ECh. 6.9 - Refer to Exercise 6.11. There appears to be a...Ch. 6.9 - A firm has a generous but rather complicated...
Ch. 6.9 - Prob. 14ECh. 6.9 - Random samples of size n1 = 8 and n2 = 8 were...Ch. 6.9 - Prob. 16ECh. 6.9 - Prob. 17ECh. 6.9 - The paper Serum Beta-2-Microglobulin (SB2M) in...Ch. 6.9 - Prob. 19ECh. 6.9 - Prob. 20ECh. 6.9 - Prob. 21ECh. 6.9 - Prob. 22ECh. 6.9 - A random sample of eight pairs of twins was...Ch. 6.9 - Refer to the data of Exercise 6.11. A potential...Ch. 6.9 - Researchers are studying two existing coatings...Ch. 6.9 - Prob. 27ECh. 6.9 - The paper “Effect of Long-Term Blood Pressure...Ch. 6.9 - A study was designed to measure the effect of home...Ch. 6.9 - Prob. 30ECh. 6.9 - A random sample of eight pairs of twins were...Ch. 6.9 - Refer to Exercise 6.31. a. What is the level of...Ch. 6.9 - Use the level and power values for the paired t...Ch. 6.9 - Use the level and power values for the paired t...Ch. 6.9 - A study was conducted to determine whether...Ch. 6.9 - The effect of Benzedrine on the heart rate of dogs...Ch. 6.9 - Prob. 37E
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- For the z test, the critical region for rejection of HO? A) is determined only by alpha b) is determine only by Alpha and N c) Allows us to except the null hypothesis d) is determine only buy Narrow_forwardThe size of leaves taken from bramble bushes were measured to see if there is adifference between the size of the leaves growing in full sunlight and those growing inthe shade. Test the hypothesis using 0.05 level of significance.Width Of Leaf / Cm Sunlight6.0 4.8 5.1 5.5 4.1 5.3 4.5 5.1Shade 6.5 5.5 6.3 7.2 6.8 5.5 5.9 5.5 is this a wilcoxon test or mann whitney test ? and how do i do this question in hand calculation method. attached ceritical table for the two testsarrow_forwardFrom the following statistics, test with the Wilcoxon Rank Sum test and a level of significance of 5% to determine whether the location of population 1 is to the right of the location of population 2. T1=1205; n1=27 T2=1280; n2=29 The test statistic (using T=T1) and the decision for this test are: 1 Z=11.01 and the null hypothesis is not rejected 2 Z=11.01 and the null hypothesis is rejected 3 Z=7.14 and the null hypothesis is rejected 4 Z=7.14 and the null hypothesis is not rejectedarrow_forward
- Consider the following null and alternative hypotheses. Ho : μ =20 Ha : μ > 20 At α = 0.025, what is the appropriate rejection region if z-test is to be used? z ≥1.69 z > 1.69 z >1.96 z ≥1.96arrow_forwardConsider the following two formulations of the bivariate PRF, where ui and εi are both mean-0 stochastic disturbances (i.e random errors): yi = β0 + β1xi + u yi = α0 + α1(xi − x¯) + ϵ a) Write the OLS estimators of β1 and α1. Are the two estimators the same? b) What is the advantage, if any, of the second model over the first?arrow_forwardFor a two-tailed hypothesis test with α = .05 and a sample of n = 16, the boundaries for the critical region are t = ±2.120.arrow_forward
- A researcher is using a two-tailed hypothesis test with α = 0.01 to evaluate the effect of a treatment. If theboundaries for the critical region are t = ± 2.845, then how many individuals are in the sample?A. n = 23B. n = 22C. n = 21D. n = 20E. cannot be determined from the information givenarrow_forwardGiven the test statistic 3.0745 from a Welch’s T-test with Null: u1-u2=0 vs. Alternative: u1-u2>0 where S1=1.63, S2=2.01, n1=34, and n2=32, compute the p-value.arrow_forwardThe test statistic of z = 2.22 is obtained when testing the claim that p ne0.492. a . Identify the hypothesis test as being two-tailed, left-tailed, or right- tailed b. Find the P-value. c . Using a significance level of alpha = 0.01 , should we reject H_{0} or should we fail to reject H_{0} ?arrow_forward
- The test statistic of z = 1.42 is obtained when testing the claim that p>0.1. A.identify the phyothesis test as being two-tailed, left-tailed, or right-tailed. B.find the p-value. C. Using a significance level of o=0.05, should we reject H0 or should we fail to reject H0?arrow_forwardUse the standard error to construct a approximate prediction interval for Y using an alpha of 5%. (Round your answer to 2 decimal places x x Fuel Economy of Selected Vehicles (n = 73, k = 4) Obs Vehicle CityMPG Length Width Weight ManTran 1 Acura TL 20 109.3 74.0 3968 0 2 Audi A5 22 108.3 73.0 3583 1 3 BMW 4 Series 428i 22 182.6 71.9 3470 0 4 BMW X1 sDrive28i 23 176.5 70.8 3527 0 5 Buice LaCrosse 18 196.9 73.1 3990 0 6 Buick Enclave 17 201.9 79.0 4724 0 7 Buick Regal 21 190.2 73.1 3692 0 8 Cadillac ATS 22 182.8 71.1 3315 0 9 Cadillac CTS 20 195.5 72.2 3616 0 10 Cadillac Escalade 14 202.5 79.0 5527 0 11 Chevrolet Camaro 1SS 16 190.6 75.5 3719 1 12 Chevrolet Cruze LS 26 181.0 70.7 3097 0 13 Chevrolet Impala LTZ 19 201.3 73.0 3800 0 14 Chevrolet Malibu 2LT 25 191.5 73.0 3532 0 15 Chevrolet Spark LS 31 144.7 61.0 2269 1 16 Chevrolet Suburban LTZ 15 224.0 80.5 5674 0 17 Chrysler 200 Touring LX 20 191.7 72.5…arrow_forwardFind the critical value, z0, from the z table for the given parameters. a=0.10 left tailed testarrow_forward
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